package org.example.filter;


import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.example.comment.BaseContext;
import org.example.comment.R;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否登录
 *
 */
@WebFilter(filterName = "GuoLvQi", urlPatterns = "/*")
@Slf4j
public class GuoLvQi implements Filter {

    // 路径匹配器，支持通配符
    public static final AntPathMatcher antPathMatcher = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取请求路径
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}", requestURI);
        //定义不需要处理的请求路径
        String [] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
        };
        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        if (check){
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("employee"));

            /**
             * 设置当前登录用户ID
             */
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);


            filterChain.doFilter(request, response);
            return;
        }

        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
    }

    public boolean check(String[] urls, String requestURI){
        for (String url : urls) {
            boolean match = antPathMatcher.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
